<?php
header('content-type:text/html;charset=utf-8');

//向上取整
//echo ceil("3.2");


//向下取整
//echo floor(3.6);

//获得最大值
//echo max(2,3,4,566,5,6,0);


//四舍五入
//echo round(6.9);

//随机数
//echo mt_rand(10,15);


//指数
echo pow(2,10);



















